Burglar-alarm



(ModeL) W. GOLDSPOHN.

'BURGLAR ALARM.

No. 320,871. Patented June23, 1885.

WITNESSES V ATTORNEYS.

IN'VENTOR N. PETERS, Phomuche m har. Wilhillshm, D. c.

. at a distance from the door, as will be herein- 'ful Improvement inBurglar-Alarms, of which UNITED STATES- VVILLIAM GOLDSPOHN,

BURGLAR- OF LODI, \VISOONSIN.

ALARM.

SE'ECIJE'ICJA'TION forming part of Letters Patent No. 320,871, datedJune 23. 1885.

Application filed October 22,1884. (Model.)

T0 aZZ whom it may concern:

Beit known that 1, WILLIAM GOLDSPOHN,

of Lodi, in the county of Columbia and State of Wisconsin, have inventeda new and usethe following is a full, clear, and exact description.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the figures.

Figure 1 is a sectional front elevation of my improvement, part beingbroken away and showing a knob-shank and spindle in section. Fig. 2 is aside elevation of the same, partly in section. Fig. 3 is a sideelevation ofthebow, yoke, and screw for securing the alarm to the shankof the door-knob. Fig. 4is a front elevation of the upper part of theback plate of the casing. Fig. 5 represents a lever and cord forconnecting the alarm with a door-knob shank.

The object of this invention is to provide a simple and reliableburglar-alarm constructed in such a manner that it can be readilyconnected with a door knob and disconnected therefrom.

The invention relates to a burglar-alarm for doors, constructed with asliding block having an arm to engage with a pin upon anescapement-wheel, the escapement of which carries a bell-hammer, andwhich is driven by a spring connected with the casing. The sliding blockis provided with interior shoulders to engage with exterior shouldersupon a bow having circular grooves working on guides attached to thecasing. The bow is also provided with undercut shoulders to receive ayoke provided with a hand-screw for securing the bow to the shank of adoor-knob. \Vith the sliding block is connected a spring attached to thecasing, to cause the said block to make a prompt descent when the bow isreleased. The bow is connected by a string with a lever adapted to besecured to the shank of a door-knob, so that the alarm can be placedafter fully described and claimed.

A represents two plates that form the casing of the alarm, and which areconnected with each other by posts B. The front plate, A, is made withan offset to bring its upper part near and parallel with the upper partof the rear plate, as shown in Fig. 2.

Oisa coiled spring, which is placed between the front plate, A, justbelow its offset, and a guard-plate, D, secured to the said plate A.

The outer end of the spring 0 is attached to one of the posts B, and itsinner end is attached to the shaft E, around which the said spring iscoiled. The shaft E is journaled to the plates A, and with itisconnected, bya spring pawl, F, and a ratchet -wheel, G, the largeescapement-wheel H. With the teeth of the wheel H engages the escapementl, the shaft J of which rocks in bearings in the plates A.

To the escapement-shaft J is attached the shank of the bell-hammer K, sothat the said hammer will be operated by the movement of the saidescapement. L is the bell, which is attached to one of the plates A insuch a position as to be struck by the hammer K as it is vibrated.

To the escapementwheel H is attached apin. M, with which engages an arm,N, attached to a shoulder formed upon the lower edge of the block 0,which slides up and down between guide-pins P, attached to the plates A,and is drawn down by its own weight and by the elasticity of the springQ, attached to the offset of the front plate, A, and the free end ofwhich rests upon the upper end of the arm N. The upper end of the block0 is recessed to receive the lower end of the bow 'R, and is providedwith interior shoulders, S, which engage with the exterior shoulders, T,of the said bow B, so that the block 0 will be raised by the rocking ofthe said bow. In the opposite sides of the lower part of the bow R areformed grooves U, which are curved in the arcs of circles, and intowhich fit curved ribs V, or other suitable guides formed upon orattached to the inner sides of the plates A, to

bow R are formed points or teeth Z,to engage with the shank of thedoor-knob and prevent the said bow from slipping upon the said shank.

In using the alarm the bow R is passed up ward around the shank of thedoor-knob, the yoke X is inserted below the shoulders \V and above thesaid shank, and the handscrew Y is turned down until the bow R is firmlyclamped to the said shank. When thus attached any movement of thedoor-knob will turn the bow R, raise the plate 0, and withdraw the arm Nfrom the pin M, allowing the alarm to be sounded. \Vhen the knob isreleased, the weight of the case A and its attached mechanism will turnthe bow R back into a vertical position, and allow the block 0 todescend and lower the arm N into such a position that the pin M, whenthe wheel H has completed a revolution, willstrike against the said armand stop the vibration of the bellhammer, leaving the alarm set ready tosound another alarm should the door-knob be again turned, and so onuntil the spring C has run down.

In case it is desired-to place the alarm near the bed or in some otherposition away from the door, the forked end of the lever a is secured tothe shank of the doorknob by the hand-screw b, which passes through ascrewhole in one arm of the said forked end, so as to rest against thesaid shank. Upon the inner surface of the other arm of the forked end ofthe lever a are formed points or teeth 0, to engage with the shank ofthe door-knob, and prevent the said lever from slipping upon the saidshank. The other end of the lever a is perforated for the convenientattachment of the end of a string, d, the other end of which is designedto be attached to the screw Y or bow B, so that the turning of thedoor-knob and the consequent movement of the lever a will move the bow Rand cause the alarm to sound. The string at can be passed around theround of a chair, the leg of a table, or other convenient guide, to giveit the proper direction with respect to the lever to and bow R to causea movement of the door-knob to move the said how.

If desired, a string or strings from a window or other object can beconnected with the screw Y or how R to trip the alarm in case the saidwindow or object be moved.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. In a burglar-alarm for doors, the combination,with the case A, the spring 0, the escapenient I, the shaft of whichcarries the bellhammer, and the escapement-wheel H, having pin M, of thesliding block 0, having arm N and interior shoulders, S, the bow It,having exterior shoulders, T, undercut shoulders W, and curved groovesU, the yoke and screw X Y, and the guides V, substantially as hereinshown and described,whereby a movement of the said bow will release thealarm, as set forth.

2. In a burglar-alarm for doors, the combination,with the rocking bow R,having shoulders WV, of the yoke X and hand-screw Y, sub stantially asherein shown and described, whereby the said how can be readily securedto the shank of a door-knob, as set forth.

3. In a burglar-alarm for doors, the combination, with the casing A andthe ratchetwhcel H, provided with pin M, of the sliding block 0, havingarm N, the bow R, and the spring Q, substantially as herein shown anddescribed, whereby the prompt descent of the said block when releasedwill be secured, as set forth.

. 4. In a burglar-alarm for doors, the combination, with the slidingblock 0, having interior shoulders, S, of the bow R, having exteriorshoulders,T, substantially as herein shown and described, whereby amovement of the said how will raise the said block, as set forth.

5. In a burglar-alarm for doors, the combination, with the bow R, havingcircular grooves U and the casing A, of the curved guides V,substantially as herein shown and described, whereby the said how willbe pivoted to the said casing, as set forth.

\VILLIAM GOLDSPOHN.

W'i tn'esses:

S. H. WATsoN, ORRIN RICE.

